Vitamins not elsewhere specified — including Vitamin D (calciferol and cholecalciferol), Vitamin K (phylloquinone and menaquinone), and Vitamin H (biotin, when classified separately) — are grouped here when no more specific SITC heading applies. Vitamin D3 (cholecalciferol) is commercially significant as a pharmaceutical API and dietary supplement ingredient, with lanolin-derived supply chains linking it to wool-processing industries. FDA entry review applies to human-use grades, and the "NES" designation means classification officers may require detailed chemical identity documentation to confirm that a more specific heading does not apply. Importers should provide IUPAC names, CAS numbers, and certificates of analysis to support both classification and admissibility.

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